Wu Mao was bullied, and Yusuf Zuck obviously had to help him get back on his feet. Moreover, the reason Yusuf Zuck continued to let Wu Mao run this place was that it served as a stronghold. Even he himself had been curious enough to come to this "Heaven on Earth," so it stood to reason that Jerome Hart, Russ Trujillo, Pillar, Isaac Quintana, Anais Dillon, and so on and so forth, would certainly pay a visit to this "Heaven on Earth" if they ever came to Capital City. By then, they would definitely meet Wu Mao!
Meeting Wu Mao meant there was a possibility for their group to gather again.
But if they lost "Heaven on Earth," it would be difficult for the brothers to reunite.